Anchored by Jake Tapper, The Lead airs at 4 p.m. ET on CNN.
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(CNN) – Now that the search for Malaysia Airlines Flight 370 has moved underwater,
investigators are at the mercy of the walking pace of the robo-sub being used, the Bluefin-21.
Retired Naval oceanographer Van Gurley, and CNN analyst and ocean search specialist Rob McCallum weigh in on the expected technical setbacks, and upcoming challenges.